<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>计算器</title>
</head>
<body>
    <form action="/calc">
        <div style=" top: 200px; text-align: center;  ">
            数字1：<input name="num1">
            数字2：<input name="num2">
            <input type="submit">
        </div>
    </form>
</body>
</html>